Add nullability annotations to smoke-test/spring-boot-smoke-test-integration

See gh-46587

smoke-test/spring-boot-smoke-test-integration/src/main/java/smoketest/integration/SampleIntegrationApplication.java

@@ -16,6 +16,7 @@
 
 package smoketest.integration;
 
+import java.io.File;
 import java.util.function.Consumer;
 
 import org.springframework.boot.SpringApplication;
@@ -27,6 +28,7 @@ import org.springframework.integration.dsl.Pollers;
 import org.springframework.integration.dsl.SourcePollingChannelAdapterSpec;
 import org.springframework.integration.file.FileReadingMessageSource;
 import org.springframework.integration.file.FileWritingMessageHandler;
+import org.springframework.util.Assert;
 
 @SpringBootApplication
 public class SampleIntegrationApplication {
@@ -40,7 +42,9 @@ public class SampleIntegrationApplication {
 	@Bean
 	public FileReadingMessageSource fileReader() {
 		FileReadingMessageSource reader = new FileReadingMessageSource();
-		reader.setDirectory(this.serviceProperties.getInputDir());
+		File inputDir = this.serviceProperties.getInputDir();
+		Assert.state(inputDir != null, "'inputDir' must not be null");
+		reader.setDirectory(inputDir);
 		return reader;
 	}
 
@@ -56,7 +60,9 @@ public class SampleIntegrationApplication {
 
 	@Bean
 	public FileWritingMessageHandler fileWriter() {
-		FileWritingMessageHandler writer = new FileWritingMessageHandler(this.serviceProperties.getOutputDir());
+		File outputDir = this.serviceProperties.getOutputDir();
+		Assert.state(outputDir != null, "'outputDir' must not be null");
+		FileWritingMessageHandler writer = new FileWritingMessageHandler(outputDir);
 		writer.setExpectReply(false);
 		return writer;
 	}

smoke-test/spring-boot-smoke-test-integration/src/main/java/smoketest/integration/ServiceProperties.java

@@ -18,6 +18,8 @@ package smoketest.integration;
 
 import java.io.File;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.jmx.export.annotation.ManagedAttribute;
 import org.springframework.jmx.export.annotation.ManagedResource;
@@ -28,9 +30,9 @@ public class ServiceProperties {
 
 	private String greeting = "Hello";
 
-	private File inputDir;
+	private @Nullable File inputDir;
 
-	private File outputDir;
+	private @Nullable File outputDir;
 
 	@ManagedAttribute
 	public String getGreeting() {
@@ -41,19 +43,19 @@ public class ServiceProperties {
 		this.greeting = greeting;
 	}
 
-	public File getInputDir() {
+	public @Nullable File getInputDir() {
 		return this.inputDir;
 	}
 
-	public void setInputDir(File inputDir) {
+	public void setInputDir(@Nullable File inputDir) {
 		this.inputDir = inputDir;
 	}
 
-	public File getOutputDir() {
+	public @Nullable File getOutputDir() {
 		return this.outputDir;
 	}
 
-	public void setOutputDir(File outputDir) {
+	public void setOutputDir(@Nullable File outputDir) {
 		this.outputDir = outputDir;
 	}
 

smoke-test/spring-boot-smoke-test-integration/src/main/java/smoketest/integration/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@NullMarked
+package smoketest.integration;
+
+import org.jspecify.annotations.NullMarked;